bug#30063: 26.0.90; Silent fail with `rst-compile-pdf-preview'

[Noam Postavsky]

Simen Heggestøyl <simenheg@gmail.com> writes:

>        (command (format "%s %s %s && %s %s ; rm %s"
> +                       pdf-compile-program
>                         buffer-file-name tmp-filename
>                         rst-pdf-program tmp-filename tmp-filename)))
> +    (unless (executable-find pdf-compile-program)
> +      (error "Cannot find executable `%s'" pdf-compile-program))
> +    (unless (executable-find rst-pdf-program)
> +      (error "Cannot find executable `%s'" rst-pdf-program))

It's possible to have PATH and exec-path desynchronized, such that the
above code could throw an error even though the
start-process-shell-command call later would succeed.  Maybe we should
should just consider that a misconfiguration on the user's part though.